I am new in CrystalSpace.I am not sure that should the sectors be set in the same coordinate? Can I set the different sectors in different coordinate system? If that, how to transform the different coordinate system between the sectors when i have to use a portal to connect them? Thank you very much for your help!

I am new in CrystalSpace.I am not sure that should the sectors be set in the same coordinate? Can I set the different sectors in different coordinate system? If that, how to transform the different coordinate system between the sectors when i have to use a portal to connect them? Thank you very much for your help!

Sectors don't really have a coordinate system. The relative coordinate system of two sectors is defined by the space warping that the portal does. So if you use a non-space warping portal then automatically the two sectors will have same coordinate space. To control this you need to control the space warping in the portal itself.

If the sectors don't really have the coordinate system, which coordinate system the object use in the sectors, world space coordinates or camera space coordinates? Can i creat a lot of sectors, replicate them and use portal to connect them in different place, in a word, to use them many times in the same world map to compose a level to the game? For example, assume i create sector01, sector02 and use portal to connect them like this:

Can i creat a lot of sectors, replicate them and use portal to connect them in different place, in a word, to use them many times in the same world map to compose a level to the game? For example, assume i create sector01, sector02 and use portal to connect them like this:

for this i want to ues them in a labyrinth to represent the same terrain, can i do it like this? Is it right?

You can do all kinds of interesting tricks here but remember that 'sector01' is always the same sector. So if you use it multiple times like you do above you essentially end up in exactly the same sector with exactly the same coordinate system.